Scaffolding-framework clamp



J. A. GROENINGER. SCAFFOLDING FRAMEWORK CLAMP.

APPLICATION FILED DEC. 8, I9l9.

Patented Oct. 26, 1920.

{/VVENTOR.

fa/m A. Groenzn aerstares JOHN A. eRoEnIneER, or s1. Louis, MISSOURI.

WW es- SCAFFOLDINGr-FRAMEWORK CLAMIP.

Specification'of Letters Patent. Patented Oct, 26,1920; 7

Application filed December 8,1919. Serial No. 343,330;

T 0 all whom may concern: l c. Be it known that 1,; JOHN A. GROEN-INGER, a citizen of the United States, re-

siding at city of St. Louis and State of Missouri, have invented acertain new and useful Improvement in Scaffolding Framework Clamps, ofwhich the following is a full, clear, and exact description, such aswill. enable others skilledin the art-to, which it appertainstomakela'nd use the same, reference being had to the accompanyingdrawings, forming partof this specification.

in which- Hy invention has relation to improvements in clamps andconsists in the novel details of. construction morefifully set forth inthe specification "and pointed out in the claims. 1

The, object of my invention is to provide a clamp. for securingto'gether' cross members of any kind offrame work and is par tieularlyadapted to frames .onfrwhichlace curtains, or anything oflike character,are

to be stretched. 1

A further object of invention is to provide a clamp that is simple inconstruction and one that is easily attached and readily adjustable;other objects being better apparent from a detail description of myinvention in connection with the accompanying drawings, in which- Figure1 represents a side elevation of a frame, the members of which aresecured together by means of my improved clamp.

ig. 2 is an enlarged view of the ends of the frame members showing theclamp applied thereto. t

Fig. 3 is a face view with the clamp detached. r

Fig. 41 is a side elevational view of the.

of the clamp C. The clamp C consists of a base plate 3, said base platebeing provided with outwardly projecting arms 4-4 arranged at rightangles to each other on the ends of which are the confining fingers 5-5,the base platebeing further provided and opposite to theconfiningfingers 5-6,

I confining members 10-10. V

with confining fingers 6-6, respectively, in alinement with theaforesaid fingers 5 5' i V The fingers 5-6, it will be observed areonthe same side of the base plate 3 and the fingers 5-6 are likewise onthe same side of the base plate but opposite to the fingers 5-6, saidfingers 5-6 constituting a series of confining members and the fingers5-6 IZlso constituting a series of confining memers. i e

Lugs 77'- are bent from each of the arms 4 and opposite to the fingers5-6 and 5'-6 with which'lugs aline respectively. Passing through thelugs 7-7 and secured to the armed are stems 8-8 having their outer endsthreaded in order that wing nuts 9-9 maybe screwed thereon and mountedon said stem. Between the arms 4 and the wing nuts are complementaryconfining fingers 10-10, saidfingers being freely slidable upon thestems 8-8 and being adjusted thereon by'rneans of wing nuts 9-9.

Stems 8-8 project beyond the arms 14 5'-6 so that when the confiningmembers 10-10 are mounted on said stems they will be oppositely disposedto the confining fingers between which they are interposed and withwhich, they cooperate, as will hereinafter be described. 7

In assembling'a frame by means of the clamp G, the wing nut 9 isunscrewed so as to e permit the confining finger 10 to be forced in adirection away from the confining fingers 5-6, thus permitting the sidemember 2 to be inserted'in-the space between the confining fingers 5-6and intermediate confining finger 10, said fingers engaging the sides ofthe side member and securely confining said ing member 10, has beenforced into engagement with the side member 2 by screwing the wing nut9. r

The end member 1 is secured to the clamp 5 10 in the same manner as theendmember 2, it

being held in place, however, by the confining members 5-6 and 10'. 1

It is thus seen that a frame'the members of which are secured togetherby the clamp 105 C will not only be rigidbut the members will also besusceptibleof adjustment to and from each other, thereby regulating thesize of said frame by means ofthe adjustable member against movementwhen the confinherein shown at right angles to each other,

might be arranged at any angle whatever according to'the shape of theframe that it p is desired to secure.

It will be readily understood that minor changes in the size, form andconstruction of the various parts of my improyed scaffolding frameworkclamp may be made and substitutedfor those herein shown and described,without departing from the Spirit of my invention, the scope of which isset forth in the appended claims I claim: r v

1; A clamp comprising a base plate provided with a pair of confiningmembers in spaced-apart relation, and an adjustable complementaryconfining member between said pair of members and opposite thereto.

-2.-A clamp comprising a base plate provided with a pair of confiningmembers and a complementary confining member interposed between saidpair of members. 3. A clamp comprisingva baseplate .provided with a pairof confining members, and an adjustable complementary confiningmember'interposed between said pair of members.

V 7 4. A clamp comprising abase plate provided with a pair of-confiningmembers, and

a complementary confining 'member interof members ,7 and a directionopposite to the confiningme'mbers, and a complementary} confining membermounted on the stem. 7

7.- Aclamp' comprising a base plate, a series of alined adjustablecomplementary confining-members, a stem mounted on the base plate andprojecting in a direction opposite to the confining members, and acomplemen tary confining member mounted on the stem. I

8 A clamp comprising a base plate provided with outwardly projectingarms angularly arranged, said arms having confining members on theirextremities, confining members on the base plate adapted to cooperatewith the confining members on the arm, stems secured to the base plateand projecting outwardly'from the arms, a complementary confiningmemberon each stem, and means for adjusting said complementaryconfiningmemb'er. v

In testimony whereof I hereunto aflix my signature this 6th day ofDecember, 1919. Q

J OHN A. GRQENINGER.

